Friction in a derailleur system can mean the difference between a well functioning shifter and one that continues to missshift. Jagwire maintains very specific standards for friction and tests hundreds of inner wires every week to ensure these high standards are met and maintained. Lubricated and pre stretched during the manufacturing process Jagwire inner wires will provide miles and miles of performance. Die extruded stainless or Galvanized steel. Stainless wires are corrossion and rust resistant.